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A, E. MAYNARD FLUID ABRADANT SUPPLYING ME KNS Jan. 2 1930.,

OrigifialFiled Dec. .13, 1926 dlberi fitmagnard '$8*W#- Reiaued Jan. 28,1930 UNITED STATES PATENT OFFICE A ALBERT E. MAYNARD, F SOUTHBRIDGE,MASSACHUSETTS, ASSIGNOR TO AMERICAN OPTICAL COMPANY, OF SOUTHIBRIDGE,MASSACHUSETTS, A VOLUNTARY ASSOCIA- TION OI MASSACHUSETTS FLUID ABRADANTSUPPLYING MEANS Original No. 1,666,718, dated April 17, 1928, Serial No.154,584, filed December 13, 1926. Application for reissue filed July 15,1929. Serial No. 378,541.

This invention relates to improved means for supplying a fluid abradantto the working parts of a surfacing machine and has particular referenceto supplying a fluid a ra- 6 dant to the operating surfaces of tools forsurfacing ophthalmic lenses.

The principal object of the invention is to provide fluid abradantsupplying means by which the direction at which the abradant is Iuppliedto the tool may be regulated and also by which the amount of abradant sosupplied can be regulated.

Another object of the invention is to provide simple, inexpensive andeflicient means '18 for directing the direction of the fluid abradant aswell as regulating the amount of abradant supplied.

Other objects and advantages of the invention will become apparent fromthe following description taken in connection with the accompanyingdrawings and it will be understood that many modifications and changesin the details of construction and arrangement of parts may be madewithout departing 25 from the spirit of the invention as ex ressed inthe accompanying claims. I, there ore, do

not wish to be limited to the exact details shown and described, thepreferred forms only having been shown by way of illus 80 tration.

Referring to the drawings:

Figure 1 1s a partial longitudinal cross section showing the applicationof the invention to a surfacing machine;

Figure 2 is a partial longitudinal cross section through the abradantsupplying means showing the means of directing the source of supply aswell as regulating the amount of supply;

Figure 3 is a top plan view of Figure 1.

Referring to the drawings in which similar characters of referencedenote similar parts throughout, the work 1 which in the presentinstance is an ophthalmic lens, is mounted for rotation over thesurfacing tool 2. The surfacing tool 2 is carried by the spindle 3 whichis rotated by the pulley 4 and the belt 5. The work 1 is rotated orcarried over the tool 2 by means of the spindle 6 rotated W by thepulley 7 and the belt 8. An ofi'set crank arm or pin 9 is carried by thespindle 6. This crank arm has a locating pin 10 which fits into a loosebearing recess 11 in the work holder 12 which is secured to the work 1,by a cement or pitch layer 13. The crank 9 being offset from the spindle6 will tend to carry the work 1 around a circular path on the tool 2,the center of the circle being the axis of the spindle 6. The pin 10fitting loosely into the recess 11 allows the work 1 to adjust itself tothe surface of the tool 2. Surrounding the tool 2 is a pan or bowl 14which is secured to the shaft 3 and rotates therewith. In this bowl 14is a supply of fluid abradant 15, that is, an abradant such as rouge oremery carried in water. The bowl 14 being rotated by the spindle 3carries the liquid abradant around with it and has a tendency to throwit up at the sides due to centrifugal force. In the path of the abradant15 which is being thrown up at the sides as described is placed a scoopmember 16 which is supported by a rod 17 carried by the bracket rod 18and bracket 19. The bracket rod 18 may be moved up and down in thebracket 19 in the bearings 20 and locked in position by the set screw21.

The rod 17 may be moved back and forth in its bearings in the rod 18 atthe point 22 and locked in position by the set screw 21. The rod 17 maybe rotated by turning the rod 18 in its bearings 20 as a center. Theseadjustments of the rod 17 permit the scoop apron 24 to be positioned inthe path of the moving abradant 15. There is a central opening orchannel 25 in the member 16 through which the abradant 15 is forced bythe movement of the bowl 14. To regulate the amount of abradant that isallowed to pass through the channel 25 in the member 16 there is aspigot or cock 26 located in the member 16 so that by turning the samethe amount of abradant passing through the channel beyond the spigot 26will be regulated. To determine the direction at which the flowingabradant will be delivered from the channel 25 there is supplied at theend of the member 16 a revolvable turn button 27 having a centralopening or channel 28 in line with the channel 2!; and an oflset openingor spout 29 communicating with the channel 28. The fluid abrasive isemitted from the spout 29 onto the tool 2. To regulate the direction inwhich, the fluid abrasive will be delivered from the spout 29 the turnbutton 27 may be turned in its bearings 30 in the member 16 to positionthe opening or orifice 29 as desired and the turn button may be lockedin said position by means of the set screw 31.

It will, therefore, be seen that the direction at which the fluidabrasive is delivered tothe tool may be regulated by turning the turnbutton 27 and theamount of the abrasive may be regulated by turning thespigot 26 and the member 16 may be positioned in the path of the flowingabradant 15 by the proper adjustment of the rod 17, as has been hithertodescribed. i

From the foregoing description it will be seen that I have providedsimple, inexpensive and eflicient means for carrying out the objects ofthis invention andparticularly for regulating the direction of thesupply of abradant and the amount thereof.

Having described my invention, I claim:

1. Incombination with a: rotatable bowl containing a fluid abrasive, anabrasive scoop member comprising a pipeportion having an internalchannel, a scoop apron at one end and an internal annular shoulder atthe other end, a nozzle member having an annular barrel portion fittingthe internal shoulder of the pipe member and having an externalprojecting portion and a transverse recessed groove on the barrelportion, a member projecting'throughthe pipe portion into therecessedgroove onthe barrel portion whereby the barrel portion may heturned within the annular shoulder portion without separation of theparts, said nozzle member having a central channel portion aligning withthe channel portion of the pipe member and an offset channel portionintersecting the first channel portion and opening through the extendingportion of the nozzle member,and means to support the abrasive scoopmember within the bowl in operative related position with the walls ofthe bowl.

- 2. In combination-with a rotatable bowl containing'a fluid abrasive,an abrasive scoop member comprising a pipe portion having an 7 internalchannel, a scoop apron atone end and an internal annular shoulder at theother end, a nozzle member having. an annular barrel portion fitting theinternal shoulder of the pipe member and having an external projectlngportion and a transverse recessed groove on the barrel portion, screwmeans projecting through the pipe portion into the recessed groove onthe barrel portion whereby the barrel portion may beturned within theannular shoulder portion without separation of' the parts, said nozzlemember having a central channel portion aligning with the channelportion of the pipe member and an oifset channel portion intersectingthe first channel portion and opening through the extending portion ofthe nozzle member, means to support the abrasive scoop member within thebowl in operative related position with the walls of the bowl, and meansintermediate the ends of the scoop member for regulating the amount ofabrasive passing through the internal channel thereof. e

3. In combination with a rotatable bowl adapted to contain a fluidabrasive, an abrasive scoop member having a pipe portion with aninternal channel through which the fiuidabrasive may flow, adjustablesupport means supporting said scoop member in required related positionwith/the; wall of the bowl, operable meansassociated with the pipeportion by which the direction of the flow of the fluid abrasive fromthe channel therein may be changed, and an apron on the scoop memberhaving aportion positioned in: rela tion' to the channel opening so thatabrasive deflected by the mouth of the channel Opening and not goingthrough the channel will be prevented from flying into the Working partsof the machine,

4. In combination with a rotatable bowl adapted to contain a fluidabrasive, an abrasive scoop member comprising a pipe portion having aninternal channel member having one end positioned to scoop upthe fluidabrasive and a nozzle connecting por tion adjacent the other endthereof, a nozzle member having a portion rotatably fitting the nozzleconnecting portion of the pipe and having a projecting nozzle portion,said nozzle member having an internal channel leading from the pipeportionthrou'gh the nozzle portion, means to support the scoop memberWithin the bowl in operative related position with the wall of thebowl,and an apron on the scoop member having a portion positioned inrelation to the channel opening so thatabrasive deflected by the mouthof the channel opening and not going through the channel will beprevented from flying into the Working parts of the machine.

In testimony whereof, I'ha've aflixed my signature.

ALBERT E. MAYNARD,

